Multiple-point plug



o. E. MARVEL MULTIPLE POINT PLUG Dem 27, 1927. 1,653,776

Filed March 12, 1923 IN VE N TOR OBI/Y E. N 97? VE L WM A TT-ORNE YPatented Dec. 27, 1927..

onm n. menvnn, or n'nvron, OHIO.

MULTIPLE-POINT PLUG.

Application filed March 12, 1923.

This invention relates to connection plugs of the type usedin making orbreaking one or more electrical circuits.

The objectof this invention is to provide a plug which will be easilyaccessible for connecting the wires, simply and compactly constructed,and capable of handling a large number of circuits in a comparativelysmall space. Further objects will be more fully set forth in the annexedspecification and claims.

Tn the drawings:

Fig. 1 is a vertical section of my device.

Fig. 2 is a perspective view of the bottom member of the plug.

Fig. 3 is a perspective view of the intermediate member.

Fig. 4 is a perspective view of the upper member.

Fig. 5 is a bottom view of the plug.

Fig. 6 is a section on line 66 of Fig; 1.

The plug consists of three pieces, a lower part 1, an intermediate part2 which fits over part 1, and the upper'part 3, through which the wiresare led before being led through the lug 5 and connected to the sixcontacts 6, by means of suitable screws. These contacts '8 are in theform of brass or copper strips and extend down through the top of part2,

so as to lie flush with the inner cylindrical."

surface of the same. The slots in the inner surface of part 2, whichhold the contacts 6, are preferably constructed with a smaller frontopening than the inside width and the contacts 6 correspondingly made sothat they maybe slid down through the slots and thus held againstlateral movement. I The lower member 1 is mounted on a base 4: in anysuitable manner and is provided on one side with a groove 8 in whichfits the pin 7 on the inner cylindrical surface of the part 2, to assurethe assembly of parts 1 and 2 in their proper relation. On the upperface of l the part 1 is a button 9 similar to .an ordinary glove buttonwhich coacts with a fastener 10 in the part 2 to hold the partsassembled until they are intentionally separated. Inset from the surfaceof the part 1 and spaced around the cylindrical surface of the same arestrips of a suitable conducting metal 11, which extend down to thebottom of the base 4, where they are bent over and all) . ple matter.

Serial No. 624,550.

secured to the terminals 12. Riveted or screwed to the conducting strips11 are the spring contact strips 13, which cooperate with the strips 6of the member 2.

When the member 2 is placed over the part 1, the pin 7 must enter thegroove 8 before contact is made bythe contact strips, thus preventingthe possibility of wrong connections and short circuits. When assembled,the diiferent circuits are completed through the contact strips,diametrically opposite contacts being used for complete circuits, andthe contacts for completing circuits of higher voltages being separatedby greater distances from the adjacent lower voltage contacts, whencircuitsof different voltages are used. 1

It will be obvious that my invention renders it possible to have a largenumber of comparatively high voltage circuits completed in a small plugby having the contacts on the outside of one cylindrical part and theinside of the other cooperating part. By my arrangement, the contactsare all accessible .at all times and the assembly of the constituentparts of the plug structure is avery simll claim: 1. An electrical plugcomprising a substantially cylindrical member and an outer hollowcylindrical shell section within which said member fits, said member andsaid shell section being made of a suitable insulating material, aplurality of longitudinally extending conducting strips embedded belowthe cylindrical surface of said member, a plurality of elongatedlongitudinally extending flat contact stripsembedded in said shellsection to be flush with the inner surface thereof, and a springycontact member screwed to each conducting strip so as to besubstantially flush with the outer cylindrical surface to register withthe said contact L 0'5 strips when the plug is assembled.

2. An electrical plug as set forth in claim 1 together with an end capthreaded on one end of said shell section, the contact stri s beingdovetailed in said member and sand shell section.

3. An electrical plug as set forth in claim [Elli (Kill 1 having springretaining means centrally located at the end of said member to keep themember and shell section in assembled relation. 4. The plug as set forthin claim 1, said 5 conducting stripsextending beyond the end of thecylindrical member for connection directly to the wires of anexternalcircuit,

and said contact strips extending beyond the end of the shell sectionfor connection directly to the wires leading to the said shell 10section. I

In testimony whereof I aflix my signature.

ORIN E. MARVEL.

